Move ReadFileToString to the base namespace.

chrome/browser/google_apis/gdata_wapi_requests_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 #include <map>
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 1562 matching lines @@
             test_util::CreateCopyResultCallback(&result_code, &temp_file)),
         GetContentCallback(),
         ProgressCallback(),
         kTestIdWithTypeLabel,
         kDownloadedFilePath);
     request_sender_->StartRequestWithRetry(request);
     run_loop.Run();
   }
 
   std::string contents;
-  file_util::ReadFileToString(temp_file, &contents);
+  base::ReadFileToString(temp_file, &contents);
   base::DeleteFile(temp_file, false);
 
   EXPECT_EQ(HTTP_SUCCESS, result_code);
   EXPECT_EQ(net::test_server::METHOD_GET, http_request_.method);
   EXPECT_EQ(kTestDownloadPathPrefix + kTestId, http_request_.relative_url);
   EXPECT_EQ(kDownloadedFilePath, temp_file);
 
   const std::string expected_contents = kTestId + kTestId + kTestId;
   EXPECT_EQ(expected_contents, contents);
 }
 
 }  // namespace google_apis